From: MAS!
Date: January 16 2008 8:44am
Subject: Re: Lost Connection each hour :(
List-Archive: http://lists.mysql.com/mysql/210861
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> Enter your mysql shell and enter the command:
> set global max_allowed_packet=10M

I have it setted at 32M, but that is not the problem; the data are  
not too much ...

and it's strange because _ALL_ clients seems to died/be disconnected  
each hour, when the hourly cron runs..